Machine for making grinding-laps.



G. W. BOWERS. MACHINE FOR MAKING GBINDING LAPS.

` uPLIoATIoN FILED nso, z. 1912.

Patented Sept. 9, 1913.

2 SHEETS-SHEET 1.

witnesses Z ,f

` G eorfga. Zt/.Ba were Wmwfi G. W. BOWERS. MACHINE FOR MAKING GRINDING LAPs.

APPLICATION FILED DEO. Z, 1912.

2 SHEETS-SHEET 2.

Patented Sept. 9, 1913.

UNITED STATES PATENT oFFicE..

.GEORGE w. BOWERS, or soMEmILILE, MASSACHUSETTS.'

Specilcation of Letters latent.

Peten-tedsept), 1913,

Sled December 181B. .Serial No. YMASJ.

labrasive tool is 'off n kind known as dieh mond lap, and consists of n cylindrical piece of stock having -a conti ci diamo-nd powder embedded in its sur ce. As the tools of this nature nsed for 'doing line work in connection with the manu-'facture Uf watches are exceedingly small, it has been diiiicult heretcfoce to properly coat the surfaces of `the stock with the abrasive mntverial By means 'of *the :machine snch `as illustrated in the accompanying drawings, I am nbie `tc appiy the abrasive meterial and embed 'it in the 'cylindricei surface of the Stock vin a 'much iess 'period off time than heretofore.

lThe lo'loiect of my invention is 'to overcome the obiection mentioned as to 'the saving of time in the production of the grinding inps, and to distribute the abrasive and coat `tire stock evenly.

A further object off the invention is `to produce the grinding 'laps 'in absolutely true cylindrical form and in accurateJ dupiica.- tion.

'To these ends the rinvention consists in 'the impreyenrerrts which I shall now pro.

scrlbed, under the influence of a cylindrical 'Of the lccompvanying drawings: `Figure l is aneie'vation-oi the machine; Qfis; ig. 1;

Fig. 3 represents a section on line'- of- Fig. 2; Fig. 4 represents a section 'on line; c

sinn ard l1, a spacing collar 25 being upon ceed 'to ,describe/and ciaim.

an end Jeieva'tion from v'the right of Similar reference 'characters indicate 'the same or similar --parts in 'a'll of the views.

A suitable base l1'0 has standards 11 secured `thereto, said standards being lor the work bed, as hereinafter described. The standards are formed' with 'inner :horizon tal recesses 12 (Fig. 4), and with openings I3 to permit the introduction of "the work between 'the rolling members Gf the ml-i Said standards are secured to the Chine.

bese by. suitable means, as by screws 'le passing through lateral projections or feet of the-standards. The tops of the stander@ vare connected together by screws or bolts 15, the adjacent faces lof Athe two standards at Vthe 'top being 'screw-threaded for the hollow szrew post hereinafter 1re ferred to.

The reciprocating bed i6 having a top facing 17 of hardened steel or other :suite uleie materiai has side ribs 18 'which enter the recesses i@ c'f the standards. A mc'k 19 is secured to the under side of the bed i6, as tby screws indicated by dotted llines in Fig. 3. The upper portion of the bed 16 is of slightly less 'transverse area than the intermediate portion thereof, and extending around said intermediate portion `is a. strip or series 'of strips Q0 which 'project .upwardly so --as Lto form, between `their inner faces and 'the outer wail of the upper portion of the bed 1'6, a channel Ato receive amd -avoid loss of abrasive material lwhich might. escape over the edge of the facing i7.

The bed fle is mounted upon two 4oscillating toothed segments Q1, as best iilustrnted by the full and `dot-ted lines representatimi "in tFig. 1. These segments engage the 'teeth of the-rack 19 of the reciprocating bed. As

the drawings, the two segments '21 are not in alinemertt or in the same plane. One is -irronnte'd in advance of the 'other longitudinally of the machine, but they mesh with diiercnt later-nl portions of the Vratei( i9, the result of this mounting being to cause the upper surface ci? die bed 1G `to occupy a true plane parallel with the plane of the upper cli-acting Vmember hereinafter debord inserted and rolled between the two surgrces as vwill be explained more fully hereinafter. Each segment 21 is pivoted at '22 to lone end of a link 23 which is mounted u on 'a pivot pin 24 supportedfby the said pin between the two vlinks 23. As shown in Fig` l, the two links 23 extend in pcsite Ydirections from the pivot pin 24.

A bracket 96 lfor 'the 'mechanism which reciprocates the 'bed 16 is secured to the base l0 `as by screws 27 passing through lateral pro'eeti'ons or feet of said bracket. As best shown in 2, the bracket 26 is provided with ways Q8 for a slide Z9 having a vertic'a'l slot 30 (Fig. 3). -The slide Z9 is formed shown by 'comparing the several 'figures of bracket 33 is a shaft 35 having apulley 36 for a driving belt. The shaft 35 has secured to it a pinion 37 which meshes with a gear 38 mounted on a stud 39 and having a crank pin 40 entering a block 41 fitted in the vertical slot 30 of the slide 29.

As will be obvious, the mechanism just described imparts reciprocating motion to the bed 16,.the latter bein supported upon the oscillating segments. wing to thepressure required for the rolling operation as hereinafter described, the oscillating segments are necessary to support the reciprocating bed to avoid the friction that would result if said bed were'mounted to slide in or on ways.

As has been mentioned the upper portions of the standards 11 are clamped together and the inner face of each is formed as the half of a female screw so that the two standards clamped together and threaded as described provide a threaded aperture for the screw post 42, which is provided with apertures 43 to receive any suitable implement for rotating the screw post. Said screw post is hollow or formed with a vertical recess 44 for the stem 45 of the upper member or presser 46 of the machine, said upper member having a lower facing 47 of hardened steel or other suitable material. A screw 48V passing vertically through the head of the screw post 42 has its lower threaded end engaging a vertical threadedrecess in the stem 45- of the member 46. Said screw 48 is provided with a head 49 between which and the top of the screw post 42 is a spring 50.

The construction just described enables the securing of an accurate adjustment of the upper member or presser relatively to the lower reciprocating member or bed so as to vary the space between them for rolls ing the cylindrical laps.

In Figs/f/and 4 the work is indicated at a..l 'Ihefp'o'rtionthereof which is to have the abrasive material applied is either made of relatively soft metal or coat-ed with relatively soft metal, which may be tin. In operation a suitable quantity of diamond dust or other abrasive if desired is spread upon the facing of the reciprocating bed. The piece of stock is introduced through an opening 13, the screw 42 being then in such position that theV upper member is sufriciently spaced from the lower member to permit the introduction of the piece of stock.

- The screw 42 is then rotated to bring the upper member to proper position relatively to the lower member, the proper degree of movement of the screw 42 being 'gaged by suitable means, such asv graduations upon the head of the screw 42, as indicated in Fig. 1, a suitable pointer 51 being employed to facilitate the proper adjustment of the screw 42. 'The screw 48 simply preserves the proper relative positions of the screw` 42 and the presser member 46, the spring 50 keeping. the lower end of the screw 42 in Contact with the surface of the upper meniber 46, as shown in Fig. 3. If the spring 50 wereomittedand the-head 49 of screw 48 arranged to bear directly upon the top of the head of screw 42, then adjustmentof the screw 42 would be interfered with by the binding action of the head of screw 4,8, and rotation of said screw 42 would be liable either to loosen the screw 48 or cause it to bind. Hence the screw 48 and the spring 50 keep the upper member or presser 46 in proper position relatively to the adjusting screw post 42, while permitting the latter to be readily adjusted according to the diameter of the lapto be rolled.

Rising upwardly through the base 10 arev two screws 52, the upper end of each bearing against the under surface of the portion of link 23 which carries the pivot 22, so that by means of the two screws 5,2, the pivots ofthe two se ments21 may be altered in height to adjust,` the'bed 16 or leveled so that the rolling action will result in a true cylindrical product.

After the bed 16 has received its supply of abrasive material, and the piece of work a has been inserted as hereinbefore described, the reciprocations of Athe-bed 16 caused by the actuating gearing hereinbefore described will be continued long enough t-o roll the piece of work back and forth between the two hard surfaces 17, 47, which surfaces will cause the abrasive material to be pressed into the relatively soft metal ofthe work so as to produce an accurate and truly cylindrical grinding lap. l

.Having described my invention, I claim:

1. A machine of the character described, comprising two flat., hard-surfaced members, means for holding the upper member stationary, means for reciprocating the lower member in a plane parallel to the surface of the upper member, and adjusting devices for varying the space between the'two hardtionary, means for reciprocating the lower member in a plane parallel to the surface of the upper member, and independent adjusting devices for different portions of the lower reciprocatin member.

4. A machine 0% the character described, comprising a hard-surfaced bed havin a toothed lower surface, a air of oscillating segments meshing with sald toothed surface, said segments being supported one in advance of the other longitudinally of the machine but meshing with diierent lateral portions of said toothed surface, means for reciprocating the bed, and an adjustable hardsurfaced presser above said bed.

5. A machine of the character described, comprising a hard-surfaced bed having a toothed lower surface, a pair of oscillating segments meshing with said toothed surface, means for vertlcally adjusting said segments, means for reciprocating the bed, and an adjustable hard-surfaced presser above said bed.

6. A machine of the character described, comprising a hard-surfaced bed, a hard-surfaced stationary presser above the bed,` a plurality of rolling supports for the bed,

and means independent of the supports for reciprocating the bed on said supports.

7. A machine of the character described, comprising a hard-surfaced bed, means for reciprocating it, a hard-surfaced presser above the bed, said presser having a vertical stem, and a screw post having a recess to receive the stern of the presser, means being provided for yieldingly maintaining the relationship of the presser and screw post.

8. A machine of the character described, having two standards clamped together and having threaded recesses which together form a divided female screw, a screw post engaging said female screw, said post having a vertical recess, a presser having a stem enterin said recess, means for yieldingly maintaining the relationship of said screw post and presser, a bed below said presser, and means for reciprocating the bed.

In testimony whereof I have aiiixed my signature, in presence of two witnesses.

GEORGE W. BGWERS.

Witnesses:

A. W. HARRISON, P. W. PEzzE'rn. 

